Perm Guns

i found a very old ShopDesc and its show me all the guns perm like para and xm8 ..
but when i try to buy a weapon its says failed to buy item so is it possibel to make it work like try to buy it whit ap (149) or no Hope

key words : "very old"

Simple explanation, when your client contacts the server saying you want to buy a gun using the old shop files, it notices the difference between the current shop and the one you're trying to use and refuses it.

So it's not possible.